People are generally aware of the most common causes of hallucinations, like schizophrenia and a really high fever. But lesser known are the more rare causes; here are six you probably haven't heard about.

Heart attack rates are three times higher for New Orleans residents in the Hurricane Katrina aftermath. Survivors of natural disasters are often at higher risk for cardiovascular and stress-related disease.

People are increasingly able to watch global drama unravel as more and more 24-hour news channels and social media websites bring in a constant stream of disturbing footage from war zones in faraway lands, but scientists say that the constant exposure to distressing news could actually negatively impact our long term health.